[Brock]

the micron rating also affects flow rate... 10-15 is standard now for most. though the difference between a 10 micron and 30 micron sounds large but physically is quite small... One thing to note is what is worse....a 15 or 20 micron filter that needs you to do an oil change possibly sooner or that requires more circulation for good cleaning.... or one with 10 micron filter that when full of particles uses bypass valve to keep engine from losing oil flow. Either way it takes good regular maintenance and checks to make sure it is working good. Once that bypass valve opens in filter...you are not filtering anything and only pumping the same dirty oil back into engine.

now that is if I understand how they work properly.... everything has a drawback if left unattended.